Piston-packing



(No Model.)

J. GARRISON.

PISTON PACKING.

No. 316,770. Patented Apr. 28, 1885.

- [NVENTDB 1 BY ATTORNEYS.

WITNESSES: ca w m N, PETERS, PhaloUihugmphev. Washing) FFIcE;

PATENT JACKSON GARRISON, OF MILNES, VIRGINIA.

PISTON PACKING.

SPECIFICATION forming part of Letters Patent No. 316,770, dated April 28, 1885.

Application filed August 16, 1884. (No model.)

To aZZ whom it may concern:

Be it known that I, J AOKSON GARRISON, a citizen of the United States, residing at Milncs, in the county of Page and State of Virginia, have invented a new and useful Improvement in Piston-Packings, of which the following is a description.

Figure 1 represents a plan view of a piston with the follower removed, and with my improved packing applied to the rings. Fig. 2 is a side view of the same, partly in section.

This invention relates to those pistons working in cylinders in which metallic rings are used as packing; and it consists in the detailed construction of the same as hereinafter described,vvhereby the said packing-rings may be readily adjusted to the degree of tightness necessary to make. a perfect working fit, and may be reset fromtime to time, as required by the wearing of the cylinder and of the ring working against it, and whereby the degree of tightness given to said packing-rings may at all times show upon a suitable graduated scale.

I will now proceed to describe my invention with reference to the accompanying drawings, in which similar letters of reference, where used in the different figures, indicate corresponding parts.

A is the piston, provided with a central hole, a, in which the piston-rod is secured, with a series of chambers, B, and with one which is open on that side of it next to the piston-rings, and marked 0.

D is the outer ring, which is split at d, as customary with packing-rings.

E is the inner ring, split at e, and provided with a series of notches, e, on either side of the opening, to receive the ends of the adjustingpawls. This ring keeps the outer ring, D, from turning round by the stud cl, which is fixed in it between the split ends of ring E.

F is the piston-follower, secured to the body of the piston by bolts atf.

G are set-screws, which assist in keeping the piston A in a central position.

H is a stud provided with a square shank, h, which is placed in asocket in the metal surrounding holea in the chamber 0, and passes through the hollow adjusting-screw h, which fits loosely upon it.

I is the adjusting-block, threaded to fit the screw h, and provided with sockets i, in which the adj listing-pawls t" are pivoted.

ing-rings.

K is a spring bearing against the body of the piston at one end, and against the head of the hollow adj usting-screw h at the other, and surrounding stud H.

h is a check-nut to prevent the hollow screw h from working loose in the adjustingblock.

M is a graduated scale attached to the body of the piston, and extends toward the pack- It indicates the tightness of the same by the position of the adjustable parts.

Spring K'is made of a certain fixed strength, and by pressing upon the head of the adj usting-screw h forces the ends of the split ring E apart by means of the pawls i',pivoted in the adjusting-block I, which is threaded to fit the said adjusting-screw h. When it is desired to tighten the packing-rings in the cylinder, the piston-follower is removed and the checknut h slackened, the position of the edge of the adj usting-block on the scale being first noted. The adjustingscrew h is then turned, so as to compress the spring K until the edge of the adj Listing-block comes against that division on the scale which indicates that the required tightness in the rings has been obtained. The checknut is then tightened against the adjusting-block and the pistonfollower replaced.

Having thus described my invention, what I claim, and desire to secure by Letters Patent,

1. In. combination with the body of a piston, the stud H, provided with asquare shank, the hollow adj usting-screw h, adj HSlilIlg-blOCk I, pawls i, spring K, and split .ring E, provided with notches e, for receiving the ends of said pawls, substantially as described and shown, and for the purpose set forth.

2. In combination with the body of a piston, the stud H, provided with a square shank, the hollow adjusting-screw h, adjusting-block I, graduated scale M, for indicating position of said block, spring ,K, pawls i, and split ring E, provided with notches e, for receiving the ends of said pawls, substantially as described, sliown, and specified.

J AGKSON GARRISON.

Witnesses:

SoLoN G. KEMON, CHAS. A. Pnrrrr. 

